FileSystem bug ?

[Michał Januszczyk]

I have found a strange behavior

I use FileInfo class to retreive LastWriteTime property of some file
The file is just a JPEG image. When the image is editted by photosho
(actually the image is rotated), the LastWriteTime property
shows correct modification date. However, when I rotate the image
with the built-in WinXP Image Viever, the property does not reflec
the recent image change: it shows previous {image changing date}

I checked Image properties using windows explorer, and it show
exactly the same what FileInfo class does. If image is modified (rotated
by winXP built-In Image Viewer, the "Modified" property does not
reflect the recent image change.

The only thing I noticed that changes are file attributes
After rotation with WinXP Image Viewer, the "archive" attribute is removed

So, is it a bug or XP Image viewer modifies files
in a way that bypasses FileSystem .. or what ??

The most important thing I would like to know is actual file modification
date (date of last modification), regardless of what program had been
used to modify the file. Is it somehow possible

Thanks In Advanc
Michał Januszczy

[Willy Denoyette [MVP]]

Works for me. Are you sure you save the image when done?

Willy.

"Michal Januszczyk" <an*******@disc ussions.microso ft.com> wrote in message
news:9D******** *************** ***********@mic rosoft.com...

I have found a strange behavior:

I use FileInfo class to retreive LastWriteTime property of some file.
The file is just a JPEG image. When the image is editted by photoshop
(actually the image is rotated), the LastWriteTime property
shows correct modification date. However, when I rotate the image
with the built-in WinXP Image Viever, the property does not reflect
the recent image change: it shows previous {image changing date}.

I checked Image properties using windows explorer, and it shows
exactly the same what FileInfo class does. If image is modified (rotated)
by winXP built-In Image Viewer, the "Modified" property does not
reflect the recent image change.

The only thing I noticed that changes are file attributes.
After rotation with WinXP Image Viewer, the "archive" attribute is
removed.
So, is it a bug or XP Image viewer modifies files
in a way that bypasses FileSystem .. or what ???
The most important thing I would like to know is actual file modification
date (date of last modification), regardless of what program had been
used to modify the file. Is it somehow possible ?

Thanks In Advance
Michal Januszczyk

[Willy Denoyette [MVP]]

Works for me. Are you sure you save the image when done?

Willy.

"Michal Januszczyk" <an*******@disc ussions.microso ft.com> wrote in message
news:9D******** *************** ***********@mic rosoft.com...

I have found a strange behavior:

I use FileInfo class to retreive LastWriteTime property of some file.
The file is just a JPEG image. When the image is editted by photoshop
(actually the image is rotated), the LastWriteTime property
shows correct modification date. However, when I rotate the image
with the built-in WinXP Image Viever, the property does not reflect
the recent image change: it shows previous {image changing date}.

I checked Image properties using windows explorer, and it shows
exactly the same what FileInfo class does. If image is modified (rotated)
by winXP built-In Image Viewer, the "Modified" property does not
reflect the recent image change.

The only thing I noticed that changes are file attributes.
After rotation with WinXP Image Viewer, the "archive" attribute is
removed.
So, is it a bug or XP Image viewer modifies files
in a way that bypasses FileSystem .. or what ???
The most important thing I would like to know is actual file modification
date (date of last modification), regardless of what program had been
used to modify the file. Is it somehow possible ?

Thanks In Advance
Michal Januszczyk

[Michał Januszczyk]

----- Willy Denoyette [MVP] wrote: ----

Works for me. Are you sure you save the image when done

Yes I'm sure. The image is saved automatically when it is rotated. You can even
find that the image size changes.

Once again: I view JPEG file with "Image And Fax Viewer" (ships with WinXP), rotate
the the file (just after the operation You can see that image size changed).
Then I right click the image, see properties and the file "Modified date" shows some
old date (date that the file was modified by some other program).

If You had hanged the file by some other software (e.g. photoshop), and just
after that You used Windows Image Viewer to do the same, the modified
date shows the right date because the {file changing} by photoshop and by the
Image Viever took place the same day (the modified date does not show exac
time, just day).

So You might want to rotate the file with WinXP Image Viewer first, and
see file properties.

I checked this behavior on three diffrent machines, and all the three behave the same
(all running WinXP Professional)

Thank
Michał Januszczyk

[Michał Januszczyk]

----- Willy Denoyette [MVP] wrote: ----

Works for me. Are you sure you save the image when done

Yes I'm sure. The image is saved automatically when it is rotated. You can even
find that the image size changes.

Once again: I view JPEG file with "Image And Fax Viewer" (ships with WinXP), rotate
the the file (just after the operation You can see that image size changed).
Then I right click the image, see properties and the file "Modified date" shows some
old date (date that the file was modified by some other program).

If You had hanged the file by some other software (e.g. photoshop), and just
after that You used Windows Image Viewer to do the same, the modified
date shows the right date because the {file changing} by photoshop and by the
Image Viever took place the same day (the modified date does not show exac
time, just day).

So You might want to rotate the file with WinXP Image Viewer first, and
see file properties.

I checked this behavior on three diffrent machines, and all the three behave the same
(all running WinXP Professional)

Thank
Michał Januszczyk